The R53 3-Channel Horizontal 500 Series Rack with Linking Option from BAE features a strong steel chassis, three pairs of Neutrik XLR input and output jacks, and a link switch to combine channels and create a channel strip. It can be used with 500 series modules (sold separately) such as a mic pre, EQ, and compressor, with each module having direct output independently, or linked together for a single signal path. In addition, the R53 wires are shielded on individual connectors—no PCBs— for serviceability.